Dielectric screening effects on transition energies in aligned carbon nanotubes

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Dyatlova OA, Gomis-Bresco J, Malic E, Telg H, Maultzsch J, Zhong G, Geng J, Woggon U
Zeitschrift: Physical Review B
Verlag: AMER PHYSICAL SOC
Jahr der Veröffentlichung: 2012
Band: 85
Heftnummer: 24
ISSN: 1098-0121


Abstract


The optical transition energies E-ii of carbon nanotubes (CNTs) strongly depend on the dielectric function epsilon(q) of the nanotubes and the dielectric background constant epsilon(bg) of their surroundings. It becomes particularly evident when CNTs in solution and free-standing, vertically aligned CNTs are compared via their optical spectra. Using photoluminescence-excitation spectroscopy, we determine the first two transition energies for these two types of carbon-nanotube samples, i.e., for CNT-solution and CNT-forest samples. We observe considerable energy shifts and explain them by microscopic calculations based on the density-matrix formalism. Combining experiment and theory, we determine the dielectric background constant of the CNT-forest and CNT-solution samples to be 1.3 +/- 0.1 and 1.8 +/- 0.1, respectively.



FAU-Autoren / FAU-Herausgeber

Maultzsch, Janina Prof. Dr.
Lehrstuhl für Experimentalphysik


Autor(en) der externen Einrichtung(en)
Technische Universität Berlin
University of Bolton
University of Cambridge


Zitierweisen

APA:
Dyatlova, O.A., Gomis-Bresco, J., Malic, E., Telg, H., Maultzsch, J., Zhong, G.,... Woggon, U. (2012). Dielectric screening effects on transition energies in aligned carbon nanotubes. Physical Review B, 85(24). https://dx.doi.org/10.1103/PhysRevB.85.245449

MLA:
Dyatlova, Olga A., et al. "Dielectric screening effects on transition energies in aligned carbon nanotubes." Physical Review B 85.24 (2012).

BibTeX: 

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